When Briana Clarke heard popping sounds on a Seattle college campus Thursday, she thought the source must be something innocent - bursting balloons. Then she saw a classmate running frantically, saying someone had been shot.

A gunman had opened fire at Seattle Pacific University, killing one person and wounding two more before he was tackled by a student security guard, Seattle police said.

The gunman was reloading a shotgun when the tackler, working as a building monitor, used pepper spray and knocked him down, police Capt. Chris Fowler told reporters.

"Once on the ground, other students jumped on top of them and subdued the shooter," he said.

The suspect, 26-year-old Aaron Ybarra, is not a student at the school, police said.

They say they think he acted alone, but the investigation is continuing. Police did not disclose a motive.

Max Broderick remembers exactly what he did a year ago Tuesday. He ran down fences, drove through fields and over curbs to get his family out of the way of the historic tornado that tattered Moore, Oklahoma.

The dark gray monster that killed 24, including 9 children, was in his rear-view mirror, lathing a 17-mile wound into the landscape that was more than a mile wide in places.

Once it was gone, the Brodericks returned to their hometown just south of Oklahoma City.

The whirlwind - an EF5 tornado, the most destructive on the Fujita scale - had sheared houses, schools, businesses into sticks, bricks and shards that lay jumbled and jagged in the straight-line rows of their subdivision streets.

The Brodericks' home and everything in it was gone, but something else was on Max's mind - his neighbors who were missing.

He and other survivors ran up and down the street. "If you can hear me, call out," he cried to anyone who might have been stuck under rubble and still alive.

The damage was so complete that when rescuers moved in, city officials raced to print new street signs to help guide them through the apocalyptic landscape.

Oscar Pistorius got a harsh grilling from the prosecution in his murder trial Wednesday.

"You made a mistake? You shot and killed her. Say it - 'I shot and killed Reeva Steenkamp,'" prosecutor Gerrie Nel told Pistorius as he began a blistering cross-examination of the Olympic sprinter.

Nel vowed to "get to the truth" as he questioned Pistorius about the killing of his girlfriend on Valentine's Day last year.

The prosecutor immediately boxed the double-amputee athlete into a corner in what his defense team described as an "ambush," by asking him about a video showing Pistorius shooting a watermelon at a gun range.

No one disputes that Pistorius killed Steenkamp. But the prosecution is trying to prove beyond a reasonable doubt that he did so knowingly and intentionally - that it was murder.

Pistorius, 27, has admitted to the killing but said he had mistaken Steenkamp for an intruder in the bathroom when he fired through the door and killed her.

Before Nel went after Pistorius, Barry Roux - the runner's defense lawyer - had tossed his client a question to drive that argument home. He asked Pistorius if he had intentionally killed Steenkamp.

"I did not intend to kill Reeva or anybody else for that matter," Pistorius replied.

Later in the proceedings, Nel probed further, questioning the runner's assertion that the shooting was an "accidental discharge."

"I never intended to shoot anyone," Pistorius said, adding that he thought he would be attacked when he heard the noise.

"I had a fear, I didn't have time to think, I discharged my firearm ... I didn't intend to shoot at anyone, I shot out of fear."

Court was adjourned for the day following that testimony.

You can watch the trial as it continues on "New Day" from 6-9am ET and follow along with CNN's live blog HERE.